Derbyhaven (Manx: Camys y Ree, 'King's Harbour') was historically regarded as the Isle of Man's most important harbour due to its proximity to Castletown. Derby Fort, on the tidal St Michael's Isle guarding the harbour entrance, was built in 1645 by James Stanley, 7th Earl of Derby, replacing an earlier fort raised around 1540 under Henry VIII. Herring houses built in 1771 on the shore were used for salting and smoking the catch, reflecting the port's fishing heritage.

Dhoon Glen is the deepest of the Isle of Man's National Glens, a steep, wooded ravine running about a mile from the hills down to a secluded pebble beach five miles south of Ramsey. Partway down, the stream drops over the 'Inneen Vooar' ('Big Girl'), one of the island's highest waterfalls, cascading more than 40 metres in two stages into a plunge pool reached by a steep path. In the 1880s and 1890s the paddle steamer Manx Fairy called at Dhoon Bay to land day-trippers who spent the day on the beach or exploring the glen; today it can still be reached on foot from a stop on the Manx Electric Railway.

A granite quarry on the coast north of Laxey. The Manx Electric Railway's own Dhoon West Quarry was worked from around 1900 into the 1930s, while an adjacent Isle of Man Highway Board quarry at the same site continued operating until 1972, both producing hard-wearing granite setts for road paving. Stone was carried out by a 225-metre aerial ropeway to a loading platform on a siding of the Manx Electric Railway, whose Dhoon Quarry Halt request stop still serves the site today as a permanent-way maintenance depot.

District near Dublin associated with the Irish property and family connections of the Manx merchant George Moore. George Moore of Peel married Catherine Callan, the daughter of a Dublin merchant, in 1733. His surviving letter books show that his commercial and family interests extended well beyond the Isle of Man. An account of Moore's career records that he held substantial interests in Ireland, including an estate at Donnybrook. These interests took him to Ireland annually. The same account contrasts this with his developing Manx business: by 1750 he had been established at Peel for many years and had ceased to take part in the older Moore family concern at Douglas. The Donnybrook property therefore appears in the surviving evidence as part of the wider network maintained by a Manx merchant whose trade, property and family relationships crossed the Irish Sea. The present evidence pack contains only one direct Donnybrook reference, and it does not provide details of the estate's size, exact location or later ownership.

Doran's Bend is named for Grand Prix racer Bill Doran, who broke his leg crashing his AJS on the left-hand bend after Ballig Bridge during a Thursday-evening practice session. Sources differ slightly on the year: Doran's own racing biography places the crash in 1952 practice for the Isle of Man TT, while a separate course-corner listing gives 1950; either way, the bend has carried his name ever since. Doran went on to finish runner-up to Geoff Duke in the 1951 350cc world championship before a later crash at Rouen ended his career in 1953.

Capital and largest town of the Isle of Man, on the east coast at the mouth of the rivers Dhoo and Glass. The Manx form Doolish was explained by an early dictionary as referring to the meeting of the two rivers, one described as black and the other as green or white, their junction producing a dark green colour. The rivers meet immediately above the harbour and provided the anchorage around which the old town developed. Douglas was still a relatively small settlement in the early eighteenth century, but its harbour and position on the east coast encouraged rapid commercial growth. George Moore, the Peel merchant, began acquiring property there in the 1750s. In 1751 he complained that houses and cellars were difficult to obtain because the town was crowded with people coming in from elsewhere and almost every available space was occupied. The harbour became increasingly important as trade expanded. By the end of the eighteenth century harbour duties, together with the herring custom and bay fisheries, formed a substantial part of the revenue available for the maintenance of the Island's ports. The harbour fund for the year ending July 1791 produced £319 5s. 1½d. in harbour duties and £95 19s. 3½d. from the herring custom and bay fisheries, although £327 was spent on repairs. Douglas gradually displaced Castletown as the Island's principal commercial centre. The growth of the town brought new churches, streets, quays and public buildings, and the settlement spread beyond the older harbour-side streets into Braddan and Onchan. The old river crossings and the harbour continued to determine the shape of the centre. Municipal growth produced increasingly expensive public works. In 1929 the House of Keys was reminded that Douglas Corporation, while still a Board of Commissioners, had paid £140,000 for the Douglas Waterworks Company and subsequently spent between £180,000 and £190,000 developing the undertaking. By the twentieth century the House of Keys and Tynwald were also meeting in Douglas, although the Island's older administrative centre remained at Castletown for much of the nineteenth century.

The stables on Tramway Terrace, at the northern end of Queen's Promenade, originate from 1877 when Thomas Lightfoot, the tramway's founder, bought a small property with a rear yard here near the original terminus of what would become the Douglas Bay Horse Tramway. He built a larger stables to the rear and a terrace of three plain, cement-rendered houses facing the road; the resulting "Lower Stables" could house up to 33 tram horses once a lean-to extension was added in the 1880s. In 1911-12 Douglas Corporation redeveloped the associated Upper Stables site, converting old shops into rentable premises with saddlers' workshops above and moving the blacksmithing operation into a rear lean-to. The tramway itself, begun in 1876, is the longest continuously operating horse tramway in Britain, having run every year except during the Second World War.

The Douglas Borough War Memorial on Harris Promenade stands fifty feet high on the site of a former bandstand, comprising a stepped stone base and a tall column of Manx granite topped by a bronze figure of a soldier, set within a railed flower garden. It was designed by the architect Ewart Crellin, with carving executed by Harry Hems & Co, and cost around £3,000, raised by public subscription; the design was approved and subscriptions were being collected as reported in 1922, with the memorial unveiled by Lord Derby on 29 May 1924. The names of Douglas's First World War dead are recorded on slate plaques on the base, with a lower plaque of 1939-45 names added later, and a small bronze plaque added afterwards for two further names.

Douglas Borough Cemetery on Glencrutchery Road contains a war memorial along with numerous individual First World War graves and grave additions recorded by the Imperial War Museum's War Memorials Register. Beyond its role as the city's principal cemetery, adjoining the TT course start/finish area, no further verifiable detail about the memorial's design, unveiling date or inscriptions could be confirmed from available sources.

Douglas Head Apartments occupies the site of the former Douglas Head Hotel, whose distinctive tower was incorporated into the hotel building in 1869. The hotel was converted into residential apartments in 1992, and the historic tower remains a visible feature of the complex today. The building enjoys a prominent clifftop position near Douglas Head Lighthouse and the Camera Obscura, with wide views over Douglas Bay and the town.

The Douglas Hotel on North Quay traces its origins to 1759, when the Ulster merchant Robert Black leased a 64-foot quayside frontage from the Duke of Atholl and built a residence on the plot, which was later used by the 4th Duke of Atholl as his Island residence. The building appears in late nineteenth-century Douglas trade directories as a hotel, reflecting North Quay's long history as a merchants' and shipping quarter of the town.

1a Howard Street, Douglas, IM1 2EQ, near the junction with Victoria Street. A small white plaque reading "OLD SEA WALL" mounted on an exposed run of natural rock face set into the modern street wall, next to a shopfront. The rock strata are the original shoreline geology, left exposed and marked rather than built over when the street was developed on reclaimed land.

Douglas railway station, at the landward end of the harbour at Bank Hill, is the terminus of the Isle of Man Railway and was once the hub for lines that also ran to Peel, Ramsey and Foxdale before those closed. It opened on 1 July 1873; the present main station building was designed in 1888 but not built until 1891-92, and the iron-and-glass canopy across its front was added in 1909, with further rebuilding in 1901, 1991 and 2016. An ornamental gateway at the Peel Road/Athol Street corner, with twin gilt-topped turrets and a clock tower, forms part of the historic station complex, which was registered as a protected building of the Isle of Man in 1984.

The Douglas Swing Bridge crosses the harbour at South Quay and was built in 1895 by Sir W. G. Armstrong-Mitchell & Co. Ltd of Newcastle-upon-Tyne, at a cost of £6,590. The bridge weighed some 450 tons and measured 176 feet long by 24 feet wide, with a footpath along one side, and it originally operated as a toll bridge, replacing an earlier swing bridge referred to in guidebooks from the 1870s. It remains a working link across Douglas Harbour and a reminder of the town's Victorian engineering heritage.

Douglas Town Hall, at the junction of Ridgeway Street and Prospect Hill, was completed in 1900 to a Renaissance Revival design by the London architects Ardron & Dawson, built by Gradwell and Co. of Barrow-in-Furness at a cost of £25,708 and formally opened on 10 May 1900 by Mayor Alderman Samuel Webb. It was commissioned after the Douglas Municipal Corporation Act of 1895 created an elected town council, replacing an earlier town hall in St Barnabas Square, and it combines the council offices with a public library and the former fire brigade offices under one roof. Its council chamber, 47 feet long by 32 feet wide, has an ornate arched ceiling designed by Warings of London. Following Douglas's elevation to city status in 2022, the building became Douglas City Hall, and Queen Camilla visited on 20 March 2024 to formally mark the change.

No verifiable TT-specific information could be found for Dub Cottage beyond its position on the course (around the 16.2-mile mark, between Birkin's Bend and Ballacrye). It appears to be a simple cottage place-name with no documented racing incident or story attached.

Dub ny Marroo ("Pool of the Dead") is located on Lamb Hill along the funeral road (Bayr ny Merroo) from Shellack Point to Kirk Bride in the north of the Isle of Man. When a funeral procession passed this way, the bier was laid down on a stone beside the pool, a prayer was said, and a handful of water was sprinkled on the corpse before the journey continued to the parish church.

Dublin is the capital of Ireland. It was closely connected to the Isle of Man through trade, administration, and the movement of people, particularly during the eighteenth century when Manx smuggling severely affected Irish customs revenues. The annuity of two thousand pounds granted to the Duke of Atholl after the Revestment was charged on the Irish revenues. The Norse kings of Man held Dublin as well. Godred Crovan conquered the kingdom of the Isles, subduing Dublin, Leinster and parts of Scotland, and after reigning sixteen years died in Islay leaving three sons. The Manx historians observe that because the Scandinavian rulers of that period were sometimes driven out of Northumbria and sometimes out of Dublin, Man must have been a convenient headquarters for them, and they note the intervals when Dublin was again subject to Irish rulers. The scholarly traffic ran through Dublin too. The Irish Archaeological Society, founded there in 1840 with Prince Albert as its patron and the Duke of Leinster as president, published the editions of the Irish genealogies and customs that the Manx antiquaries used for the Norse and Gaelic centuries of their own history.

Dumbarton Rock is a volcanic plug on the Firth of Clyde in Scotland, the site of an ancient fortress. Its connection to the Isle of Man relates to the Norse Kingdom of Mann and the Isles and the broader Scottish-Manx political relationships during the medieval period.

Perthshire residence of the Murray Dukes of Atholl and a frequent point of correspondence in the administration of their Manx interests. The Atholl Papers show Manx business moving regularly between the Island and Dunkeld after Revestment. In 1775 the Duke discussed the transfer to him of his mother's remaining rights connected with the Isle of Mann and instructed that a cannon and a picture from the Island should be sent to Dunkeld when an opportunity arose. John Quayle and William Callow continued to report to the Duke on rents, mines, boons, church property and appointments. A letter of June 1777 sent from Dunkeld shows the Duke dealing with the assignment of Manx mines and the ruined chancel of Malew. He admitted that he was “too little acquainted with the affairs of the Isle of Mann” to determine the latter matter himself and instructed his agents to obtain advice from someone familiar with Manx law and custom. Dunkeld was also the place from which the Atholls addressed the proposed sale of the Island. On 18 July 1764 the Duke wrote to Daniel Mylrea denying reports that he and the Duchess were about to sell Mann and stating that no approach had then been made by government. A surviving memorandum copied at Dunkeld in 1759 also set out the Duke's earlier response to Treasury approaches, insisting that any transfer to the Crown would leave the Manx inhabitants with their own constitution, laws, administration of justice and internal trade. The place remained part of Manx government correspondence after the sale. In December 1803 the fourth Duke wrote from Dunkeld proposing to resign as Governor-in-Chief of the Isle of Mann in favour of his brother Lord Henry Murray.

Dunkirk is a port city in northern France. It featured in the maritime networks connecting the Isle of Man with Continental Europe, and Manx trading and smuggling vessels frequented French Channel ports during the eighteenth century.

Dunluce is a detached house on Ballure Road above Ballure Beach, on the southern approach to Ramsey. Isle of Man planning records describe it as a "handsome detached pre-1920" Registered Building (RB 215) with steeply pitched roofline, and a 2009 planning application for a replacement conservatory was approved by the Conservation Officer on the grounds that the new design, inspired by the house's historic Victorian conservatory and detailing, enhanced rather than harmed its character. Estate listings describe it as a Victorian Gothic residence with sweeping sea views, a short walk from the centre of Ramsey.

Edge's Corner was the final named bend on the Willaston Circuit before the route rejoined the Snaefell Mountain Course at Cronk-ny-Mona, sitting between Cronk-y-Berry and that junction. No dedicated historical page, old map annotation, or race report naming an exact location for 'Edge's Corner' could be found; it does not appear on Wikipedia, Manx Notebook, or the old-OS-map indexes searched, and searches for the name elsewhere on the Isle of Man returned only unrelated results (e.g. an Edge's Corner in Dublin). It is likely a locally-known/club name for a bend on the lane approaching Cronk-ny-Mona (itself fixed at 54.18333N, -4.47583W) rather than a name that ever appeared on an Ordnance Survey map, which would explain the absence of an independent source.

Scottish capital with publishing and scholarly connections to nineteenth-century Manx historical study. Edinburgh appears in the Manx Society's bibliographical record as one of the centres through which material relating to the Island was printed and circulated. William Harrison's revised Bibliographical Account of Works Relating to the Isle of Man, issued by the Manx Society in 1876, was printed by R. & R. Clark of Edinburgh. The bibliography itself gathered printed references to Mann ranging from medieval chronicles and antiquarian works to Manx-language publications and government pamphlets. Its preface explained that the Society intended it as a guide for students of Manx history to the available sources. Edinburgh printing also linked Manx scholarship with the much wider Scottish antiquarian publishing world. The Manx Society volumes frequently drew on Scottish chronicles, Scandinavian material preserved or edited through Scottish scholarship, and comparisons with the Hebrides and western Scotland. The current evidence pack contains many references to Edinburgh which are merely publication places or unrelated parliamentary material. Only the directly Manx bibliographical connection is therefore used here.

The Conchan (Onchan) parish burial registers record an Edward Christian of Bemahague there, who died 1 March 1790 aged fifty-six. The coordinate given is that of the present St Peter's Church, Onchan (Registered Building 119); this is the parish church, not a confirmed specific grave location.